/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.bookkeeper.mledger.offload.jcloud;

import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import com.amazonaws.auth.STSAssumeRoleSessionCredentialsProvider;
import com.google.common.base.Strings;
import org.apache.pulsar.common.policies.data.OffloadPolicies;

public class CredentialsUtil {

    /**
     * Builds an AWS credential provider based on the offload options
     * @return aws credential provider
     */
    public static AWSCredentialsProvider getAWSCredentialProvider(OffloadPolicies offloadPolicies) {
        if (Strings.isNullOrEmpty(offloadPolicies.getS3ManagedLedgerOffloadRole())) {
            return DefaultAWSCredentialsProviderChain.getInstance();
        } else {
            String roleName = offloadPolicies.getS3ManagedLedgerOffloadRole();
            String roleSessionName = offloadPolicies.getS3ManagedLedgerOffloadRoleSessionName();
            return new STSAssumeRoleSessionCredentialsProvider.Builder(roleName, roleSessionName).build();
        }
    }

}
